Acquisitions Acquisitions Textuals (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016	Oct. 05, 2015	Mar. 31, 2015
Business Acquisition [Line Items]
Goodwill	$ 778.3	$ 632.1	$ 774.7
Wolverine Advanced Materials Acquisition [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	307.0
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period		154.0
Goodwill				$ 164.2
Hartzell Aerospace Acquisition [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	$ 52.9
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period		34.0
Goodwill					$ 13.7
Sales to ITT Corporation [Member] | Wolverine Advanced Materials Acquisition [Member]
Business Acquisition [Line Items]
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period		$ 17.0